Mandel E, Machtou P, Friedman S
School of Dentistry, University of Paris VII, France.
J Endod. 1990 Jun;16(6):279-83. doi: 10.1016/S0099-2399(06)81630-4.
The aim of this study was to evaluate the cleansing efficiency of three root canal preparation techniques. The distal root canals of mandibular molars, divided into three groups of four teeth each, were prepared according to the following techniques: manual (serial), ultrasonic (Cavi-Endo), and automated (Canal Finder). The canal wall surfaces were examined under a scanning electron microscope at three levels. No preparation technique was found to result in any characteristic microscopic features that distinguished it from the other techniques. The lack of such differences makes it impossible to establish objective criteria for comparing these techniques in terms of root canal cleanliness. It was established that even canals that appeared to be clean included areas coated with smear layer and having uninstrumented areas and even pulpal tissue debris.
本研究的目的是评估三种根管预备技术的清洁效率。将下颌磨牙的远中根管分为三组，每组四颗牙齿，分别采用以下技术进行预备：手动（连续）、超声（Cavi-Endo）和自动（根管探查仪）。在三个水平下通过扫描电子显微镜检查根管壁表面。未发现任何一种预备技术能产生使其与其他技术区分开来的特征性微观特征。缺乏这些差异使得无法建立客观标准来比较这些技术在根管清洁方面的情况。已确定，即使看似清洁的根管也包括覆盖有玷污层、存在未预备区域甚至牙髓组织碎片的区域。
